package com.tianji.learning.service.impl;

import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.tianji.api.cache.CategoryCache;
import com.tianji.api.client.course.CatalogueClient;
import com.tianji.api.client.course.CategoryClient;
import com.tianji.api.client.course.CourseClient;
import com.tianji.api.client.search.SearchClient;
import com.tianji.api.client.user.UserClient;
import com.tianji.api.dto.course.CataSimpleInfoDTO;
import com.tianji.api.dto.course.CourseSimpleInfoDTO;
import com.tianji.api.dto.user.UserDTO;
import com.tianji.common.domain.dto.PageDTO;
import com.tianji.common.exceptions.BadRequestException;
import com.tianji.common.exceptions.BizIllegalException;
import com.tianji.common.utils.BeanUtils;
import com.tianji.common.utils.CollUtils;
import com.tianji.common.utils.StringUtils;
import com.tianji.common.utils.UserContext;
import com.tianji.learning.domain.dto.QuestionFormDTO;
import com.tianji.learning.domain.po.InteractionQuestion;
import com.tianji.learning.domain.po.InteractionReply;
import com.tianji.learning.domain.query.QuestionAdminPageQuery;
import com.tianji.learning.domain.query.QuestionPageQuery;
import com.tianji.learning.domain.vo.QuestionAdminVO;
import com.tianji.learning.domain.vo.QuestionVO;
import com.tianji.learning.mapper.InteractionQuestionMapper;
import com.tianji.learning.service.IInteractionQuestionService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.tianji.learning.service.IInteractionReplyService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;

/**
 * <p>
 * 互动提问的问题表 服务实现类
 * </p>
 *
 * @author zzj
 * @since 2024-05-05
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class InteractionQuestionServiceImpl extends ServiceImpl<InteractionQuestionMapper, InteractionQuestion> implements IInteractionQuestionService {

    private final IInteractionReplyService replyService;
    private final UserClient userClient;
    private final SearchClient searchClient;
    private final CourseClient courseClient;
    private final CatalogueClient catalogueClient;
    private final CategoryCache categoryCache;

    @Override
    public void saveQuestion(QuestionFormDTO dto) {
        //获取当前登录用户id
        Long userId = UserContext.getUser();
        //dto转po
        InteractionQuestion question = BeanUtils.copyBean(dto, InteractionQuestion.class);
        question.setUserId(userId);

        //保存
        this.save(question);
    }

    @Override
    public void updateQuestion(Long id, QuestionFormDTO dto) {
        //校验
        if (StringUtils.isBlank(dto.getTitle()) || StringUtils.isBlank(dto.getDescription()) || dto.getAnonymity() == null){
            throw new BadRequestException("非法参数");
        }
        //校验id
        InteractionQuestion question = this.getById(id);
        if (question == null){
            throw new BadRequestException("非法参数");
        }
        //修改只能修改自己的互动问题
        Long userId = UserContext.getUser();
        if (userId.equals(question.getUserId())){
            throw new BadRequestException("不能修改别人的互动问题");
        }

        //dto转po
        question.setTitle(dto.getTitle());
        question.setDescription(dto.getDescription());
        question.setAnonymity(dto.getAnonymity());

        //修改
        this.updateById(question);
    }

    @Override
    public PageDTO<QuestionVO> queryQuestionPage(QuestionPageQuery query) {
        //检验 参数 courseId
        if (query.getCourseId() == null){
            throw new BadRequestException("课程id不能为空");
        }
        //获取当前登录用户id
        Long userId = UserContext.getUser();
        //分页查询互动问题  条件：courseId onlyMine为true才会加userId 小节id不为空才加条件 hidden为false 分页查询 按提问时间降序
        Page<InteractionQuestion> page = this.lambdaQuery()
//                .select(InteractionQuestion::getId,InteractionQuestion::getTitle,InteractionQuestion::getCourseId)
//                .select(InteractionQuestion.class, new Predicate<TableFieldInfo>() {
//                    @Override
//                    public boolean test(TableFieldInfo tableFieldInfo) {
////                        tableFieldInfo.getProperty()//获取InteractionQuestion实体类的属性对象
//                        return !tableFieldInfo.getProperty().equals("description");//指定 不查的字段
//                    }
//                })
                .select(InteractionQuestion.class, tableFieldInfo -> !tableFieldInfo.getProperty().equals("description"))//指定 不查的字段//getProperty获取InteractionQuestion实体类的属性对
                .eq(InteractionQuestion::getCourseId, query.getCourseId())
                .eq(query.getOnlyMine(), InteractionQuestion::getUserId, userId)
                .eq(query.getSectionId() != null, InteractionQuestion::getSectionId, query.getSectionId())
                .eq(InteractionQuestion::getHidden, false)
                .page(query.toMpPageDefaultSortByCreateTimeDesc());
        List<InteractionQuestion> records = page.getRecords();
        if (CollUtils.isEmpty(records)){
            return PageDTO.empty(page);
        }

        Set<Long> latestAnswerIds = new HashSet<>();//互动问题 最新回答id集合
        Set<Long> userIds = new HashSet<>();//互动问题的用户id集合
        for (InteractionQuestion record : records) {
            if (!record.getAnonymity()){//如果用户是匿名提问，则不显示用户名和头像
                userIds.add(record.getUserId());
            }
            if (record.getLatestAnswerId() != null){
                latestAnswerIds.add(record.getLatestAnswerId());
            }
        }
//        Set<Long> latestAnswerIds = records.stream()
//                .filter(c -> c.getLatestAnswerId() != null)
//                .map(InteractionQuestion::getLatestAnswerId)
//                .collect(Collectors.toSet());

        //根据最新回答id 批量查询回答信息  条件 in id集合
        Map<Long, InteractionReply> replyMap = new HashMap<>();
        if (CollUtils.isNotEmpty(latestAnswerIds)){//集合可能为空 需要做非空校验
//            List<InteractionReply> replyList = replyService.listByIds(latestAnswerIds);
            List<InteractionReply> replyList = replyService.list(Wrappers.<InteractionReply>lambdaQuery()
                    .in(InteractionReply::getId, latestAnswerIds)
                    .eq(InteractionReply::getHidden, false));
            for (InteractionReply reply : replyList) {
                if (!reply.getAnonymity()){
                    userIds.add(reply.getUserId());//将最新回答的用户id 存入userIds
                }
                replyMap.put(reply.getId(),reply);
            }
//            Map<Long, InteractionReply> replyMap = replyList.stream().collect(Collectors.toMap(InteractionReply::getId, c -> c));
        }

        //远程调用用户服务 获取用户信息 批量
        List<UserDTO> userDTOS = userClient.queryUserByIds(userIds);
        Map<Long, UserDTO> userDTOMap = userDTOS.stream().collect(Collectors.toMap(UserDTO::getId, c -> c));


        //封装vo返回
        List<QuestionVO> voList = new ArrayList<>();
        for (InteractionQuestion record : records) {
            QuestionVO vo = BeanUtils.copyBean(record, QuestionVO.class);
            if (!vo.getAnonymity()){
                UserDTO userDTO = userDTOMap.get(record.getUserId());
                if (userDTO != null){
                    vo.setUserName(userDTO.getName());
                    vo.setUserIcon(userDTO.getIcon());
                }
            }

            InteractionReply reply = replyMap.get(record.getLatestAnswerId());
            if (reply != null){
                if (!reply.getAnonymity()){//最新回答 如果是 非匿名 才设置 最新回答者的昵称
                    UserDTO userDTO = userDTOMap.get(reply.getUserId());
                    if (userDTO != null){
                        vo.setLatestReplyUser(userDTO.getName());//最新回答者的昵称
                    }
                }
                vo.setLatestReplyContent(reply.getContent());//最新回答的信息
            }
            voList.add(vo);
        }

        return PageDTO.of(page,voList);
    }

    @Override
    public QuestionVO queryQuestionById(Long id) {
        //校验
        if (id == null){
            throw new BadRequestException("非法参数");
        }
        //查询互动问题表   按主键查询
        InteractionQuestion question = this.getById(id);
        if (question == null){
            throw new BadRequestException("问题不存在");
        }
        //如果该问题管理员设置了隐藏 返回空
        if (question.getHidden()){
            return null;
        }

        //封装vo返回
        QuestionVO questionVO = BeanUtils.copyBean(question, QuestionVO.class);

        //如果用户是匿名提问，不用查询提问者的昵称和头像
        if (!questionVO.getAnonymity()){
            //调用用户服务
            UserDTO userDTO = userClient.queryUserById(question.getUserId());
            if (userDTO != null){
                questionVO.setUserName(userDTO.getName());
                questionVO.setUserIcon(userDTO.getIcon());
            }
        }

        return questionVO;

    }

    @Override
    public PageDTO<QuestionAdminVO> queryQuestionAdminVOPage(QuestionAdminPageQuery query) {
        //如果用户传了课程的名称参数  则从es中获取该名称对应的课程id
        String courseName = query.getCourseName();
        List<Long> cids = null;
        if (StringUtils.isNotBlank(courseName)){
            cids = searchClient.queryCoursesIdByName(courseName);//通过feign远程调用搜索服务， 从es中搜索该关键子对应的课程id
            if (CollUtils.isEmpty(cids)){
                return PageDTO.empty(0L,0L);
            }
        }

        //查询互动问题表 条件前端传了条件就添加条件  分页 排序按提问时间倒序
        Page<InteractionQuestion> page = this.lambdaQuery()
                .in(CollUtils.isNotEmpty(cids),InteractionQuestion::getCourseId, cids)
                .eq(query.getStatus() != null, InteractionQuestion::getStatus, query.getStatus())
                .between(query.getBeginTime() != null && query.getEndTime() != null,
                        InteractionQuestion::getCreateTime, query.getBeginTime(), query.getEndTime())
                .page(query.toMpPageDefaultSortByCreateTimeDesc());
        List<InteractionQuestion> records = page.getRecords();
        if (CollUtils.isEmpty(records)){
            return PageDTO.empty(0L,0L);
        }

        Set<Long> uids = new HashSet<>();//用户id集合
        Set<Long> courseids = new HashSet<>();//课程id集合
        Set<Long> chapterAndSectionIds = new HashSet<>();//章和节的id集合
        for (InteractionQuestion record : records) {
            uids.add(record.getUserId());
            courseids.add(record.getCourseId());
            chapterAndSectionIds.add(record.getChapterId());//章id
            chapterAndSectionIds.add(record.getSectionId());//节id
        }

        //远程调用用户服务 获取用户信息
        List<UserDTO> userDTOS = userClient.queryUserByIds(uids);
        if (CollUtils.isEmpty(userDTOS)){
            throw new BizIllegalException("用户不存在");
        }
        Map<Long, UserDTO> userDTOMap = userDTOS.stream().collect(Collectors.toMap(UserDTO::getId, c -> c));

        //远程调用课程服务 获取课程信息
        List<CourseSimpleInfoDTO> cinfos = courseClient.getSimpleInfoList(courseids);
        if (CollUtils.isEmpty(cinfos)){
            throw new BizIllegalException("课程不存在");
        }
        Map<Long, CourseSimpleInfoDTO> cinfoMap = cinfos.stream().collect(Collectors.toMap(CourseSimpleInfoDTO::getId, c -> c));

        //远程调用课程服务 获取章节信息
        List<CataSimpleInfoDTO> cataSimpleInfoDTOS = catalogueClient.batchQueryCatalogue(chapterAndSectionIds);
        if (CollUtils.isEmpty(cataSimpleInfoDTOS)){
            throw new BizIllegalException("章节信息不存在");
        }
        Map<Long, String> cataInfoMap = cataSimpleInfoDTOS.stream().collect(Collectors.toMap(CataSimpleInfoDTO::getId, c -> c.getName()));


        //封装vo返回
        List<QuestionAdminVO> voList = new ArrayList<>();
        for (InteractionQuestion record : records) {
            QuestionAdminVO vo = BeanUtils.copyBean(record, QuestionAdminVO.class);
            UserDTO userDTO = userDTOMap.get(record.getUserId());
            if (userDTO != null){
                vo.setUserName(userDTO.getName());
            }
            CourseSimpleInfoDTO cinfoDTO = cinfoMap.get(record.getCourseId());
            if (cinfoDTO != null){
                vo.setCourseName(cinfoDTO.getName());
                //获取课程一二三级分类id
                List<Long> categoryIds = cinfoDTO.getCategoryIds();//一二三级分类id集合
                String categoryNames = categoryCache.getCategoryNames(categoryIds);
                vo.setCategoryName(categoryNames);//三级分类名称，拼接字符串
            }
            vo.setChapterName(cataInfoMap.get(record.getChapterId()));//章名称
            vo.setSectionName(cataInfoMap.get(record.getSectionId()));//节名称
            voList.add(vo);
        }

        return PageDTO.of(page,voList);
    }


}
